Locking device for boring or other tools



G J. KENGEL.

LOCKING DEVICE FOR BORING OR OTHER TOOLS.

APPLICATION FILED APR. 28. 192 1.

' Patented Apr. 18, 1922.

UNITE sm'rss PA C enonen i1. KENGEL, or DETROIT, MICHIGAN, assionon ToTHE 'EcLIrsn INTER- cnanenannn COUNTERBQRE comrm, or DETROIT, MICHIGAN,A conrom- TION OF MICHIGAN.

LOCKING DEVICE FOR BORIHG OR OTHER TOOIS.

. Application filed April 28, 192].- Serial No. 465,335.

To all whom it may concern:

Be it known that I, GEORGE J. KENGEL, a citizen of the United States,residing atDetroit, county of Wayne, State of Michigan, have" invented acertain new and useful Improvement in Looking Devices for Boring orother Tools, and declare the following to be a full, clear, and exactdescription of the same, such as will-enable others skilled in the artto whichit pertains to make and use the same,- refe rence being had tothe accompanying drawings, which form a part of this specification.

My invention relates to an improvement in boring. tools or other toolsof a like character in which the cutting end is detachable from thesocket or shank of the tool.

-One of the objects of this invention is to provide means for securingthe cutting end of the tool in its socket against accidental release;the construction being such however that it may be readily removed whenre uired. 4

further object of the invention is to provide for maintaining thecutting end in registered relation to the flutes of the socket proceedsthe invention further resides inthe combination and arrangement of partsand in the details of construction hereinafter that changes may be madein the precise embodiment of the invention herein disclosed withoutdeparting from the spirit of the same.

In the accompanying drawings forming part of this specification: I

Figure 1 is an elevation partly in section, of a boring tool having adetachable cutting end.

Fi'gure 2 is a cross-sectional View taken on or about line 22 of Figure1, on a line with the transverse locking pin, showing the relativeposition of the parts upon-the initial entry of the shank of the cuttingend into the socket portion of the tool.

Figure 3 is a similar cross-sectional view showingthe shank of thecutting end rotated with reference to the socket portion of the toolthat the transverse locking pin may secure the cutting end thereto.

cured by the yieldable locking means' against accidental displacement.

Figure 5 is a similar cross-sectional view to that shown'in thepreceding figure the shank of the cutting end however bei rotated inorder that the yieldable loo 'ng device may maintain the cutting end ina fixed registered position with the flutes of the socket' portion. l I

Figure 6 is a fragmentary perspective view of the flattened cutting end.

Figure 7 is a side elevation of the yieldable locking device andsupporting plug in which it is lodged.

Figure Sis a perspective view of the yieldable locking device removedfrom the plug with parts broken awa to disclose the socket in which aspring is lodged to actuate the device.

Figure 9 is a side elevation of a modification of the tool.

Figure 10 is a cross-sectional view taken on or about line 10-10 ofFigure 9 showing portion of .the shank of the the flattened portion ofthe shank of the cutting end as it initially passes the locking ribsinthe socket: portion of the tool,before being rotated therein.

Figure 11 is a similar sectional view showing the shank of the cuttingend rotated into locking engagement with the ribs of the socket portlon.

Figure 12 is a fragmentary perspective view of the shank of the cuttingend shown in Figure Q indicatin in dotted lines the flanges of the plug0 the locking device overlapping the flattened sides of the shank.

Referring now to the letters of reference placed upon the drawings:

A, denotes the bod portion of a drill or similar tool provided with asocket B, to receive the shank C, of a detachable cutting end D. E,indicates a transverse pin extending into the socket opening,-its endsbeing supported by the annular ,wall forming the socket of the tool. Theshank C is flattened as indicated at C (see Figure 6) that into thesocket of the tool.

portion of the latter, whereby upon a slight rotation of the shank thecutting end may be locked in the socket of the tool.

F, denotes a plug lodged in the socket B having one or more downwardlyextended flanges F, adapted to overlap the flattened portions 0' of theshank. G, is a movable sleeve having a closed outer end fitted in atransverse bore provided in the plug F ;-the closed end of the sleeveG'being arc-shaped to conform to the periphery of the plug., Lodged inthe sleeve G is a sprin H, one

' end of which bears against: the en wall of i the sleeve and the otheragainst the Wall of the plug to force the sleeve outwardly. I, indicatesa screw extending throughthe wall of the socket having a rounded endadapted to alternately enter the recesses G and Gr formed in the end ofthe sleeve connected together by a peripheral groove G". In themodification shown in Figures 9, 10, and 11, the socket B of the tool isprovided with oppositely disposed flat-faced projecting ribs'B, tosecure the shank in the socket of the tool,-the shank of the tool beinformed with two flattened surfaces C, that it may pass the ribs B uponits entry into' the socket of the tool.

Having now indicated the several parts by reference letters theconstruction and operation of the device will be readily understood.

To secure the cutting end in the socket portion of the tool the shank isinserted so that the flattened end C may pass the projecting transversepin E; -the flange F of the plug F overlappin the flattened end as,shown in Fi re 1. ile in this position the end of t e screw I is lodgedin the recess G of the sleeve G; the sleeve being depressed against theaction of the spring H, when forcing the shank of the cutting end intothe socket portion of. the tool. The

shank is then given a slight rotation causing the plug F and the sleeveG, lodged therein to rotate with it, due to the flanges F of the plugoverlapping the flattened portions of the shank;the plu becoming anextension of the shank. %heset screw I is thus caused to traverse theperipheral groove G into the recess G whe'reby the flutes of the cuttingend may be maintained in registration with the flutes of the bodyportion of the tool. In rotating the tool the transverse pin E, willenter the peripheral groove C extending from the flattened portion ofthe shank, thereby locking the cutting end in the socket of the tool ;atthe same time the set screwv I serves to main tain the shank in itsadjusted position against accidental displacement.

In the modification shown in Figure 9 the shank of the cutting end isflattened on opposite sides'tha't it may pass the oppositely disposedribs B in the socket of the tool upon'the entry of the shank therein.

As will be readily understood the ribs B in the socket'of themodification are em ployed in place of the transverse pin E previousldescribed. In the modification the plug is provided with two downwardlyextended flanges F overlapping the flattened portion of the shank. Toassemble the parts the shank of the cutting end is inserted in thesocket of thetool-the flattened ends of the shank registering with theprojecting ribs B ,"while the end of the shank projects between thespaced flanges of the plug. The plug is then rotated whereupon the sprinactuated sleeve, willbe depressedto permit the screw I to pass from therecess G by way of. peripheral groove G to the recess Gr 1n the sleeve.Upon the screw entering the recess G the cutting end will be held in thesocket portion against accidental rotation.

It will be understood that the set screw I in the wall of the toolsocket is so positioned that when lodged in the recess 8* of the sleeveG, the downwardly extending flanges F of the plug F will be in properposition to receive and-overlap the flattened end C of the shank C upontheentry of the latter into the socket ;--the plug F is thus securedagainst accidental rotation or displacement peripheral groove, and anelement supported in the wall of the socket portion adapted to bealternately lodged in the recesses of the spring actuatedmember tosecure the plug and the shank of the tool against accidentaldisplacement.

2. A tool including a socket portion, a removable cutting end providedwith a shank having a flattened end adapted to enter said socketportion, means for securing the cut-,

ting end in said socket portion, a rotatable plug lodged in the socketportion provided with a flange adap ed to overlap the flattened end ofthe shank, a spring actuated sleeve lodged in a transverse bore in saidplug having a closed outer end provided with spaced recesses, connectedby a periph-' eral groove, and a set screw supported in the wall of thesocket portion adapted to be alternately lodged in the recesses of thespring actuated sleeve to secure the plug and flattened at its end andadapted to enter the socket portion, with a peripheral groove in saidshank extending from the flattened portion to receive a locking pin, atransverse docking pin supported in the wall ofthei socket portionadapted to enter said peripheral groove in the shank, a rotatable pluglodged in the socket portion in advance of the shank of the cutting endand provided with a flange overlapping the flat 15 tened end of theshank, aisleeve lodged in a transverse bore in said plug, its closedouter end provided with spaced recesses connected by a peripheralgroove, a spring adapted to actuate said sleeve and a set screwsupported in the wall of the socket portion adapted to alternately enterthe recesses of the spring actuated sleeve to secure the plug and theshank of the tool When adjusted against accidental displacement.

"In testimony whereof, I sign this specification in the presence of twowitnesses.

, GEORGE J. KENGEL. Witnesses:

META H. SoHULzE, Roy S. MIOHELL.

